Specialized Engineering

Owner:

Fairfax County Water Authority

Client:

Roger Conin

(804) 355-9993

Greeley & Hanson

Scope Of Work

Description:               

The Corbalis Water Treatment Plant (WTP) Expansion – Stage 2 Development included the expansion to the existing WTP facilities.  The overall scope consisted of a new Water Quality Laboratory, a new Visitors Education Center, a new vehicular entrance, and the installation of new site utilities and infrastructure.  The new reinforced concrete Ozone contactor, a structural enclosure of a 300-foot walkway, a liquid oxygen storage facility with two (2) 13,000 gallon tanks, and 470 linear feet of 96” pipeline and appurtenances were also constructed and/or installed as part of the overall Stage 2 Development.

Scope of Services: 

Field Quality Control and Special Inspection Services included construction materials testing and inspection of foundation soil bearing, structural fill, utility backfill, reinforcing steel, cast-in-place concrete, structural steel, spray-applied fire-resistive materials, ornamental handrails and railings, and built-up asphalt roofing.  Special Inspections also included ensuring the project team was constructing the expansion in compliance with procedural requirements of the Fairfax County Special Inspections Program Manual which included the following:  Attendance at FCCS preconstruction meetings, analysis and verification of approved documents and certification of special inspections.

Laboratory Testing & Analysis Services included that of proposed fill materials, cast-in-place concrete cylinders, mortar and grout, asphalt, and fireproofing density samples.